Add weighted_sum utility to articlequality/utilities to calculate wei…

[chtnnh]

…ghted sum from revscoring score output

[codecov-io]

Codecov Report

Merging #128 into master will decrease coverage by 0.52%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #128      +/-   ##
==========================================
- Coverage   52.79%   52.27%   -0.53%     
==========================================
  Files          46       47       +1     
  Lines        1341     1364      +23     
==========================================
+ Hits          708      713       +5     
- Misses        633      651      +18     

Impacted Files	Coverage Δ
articlequality/utilities/weighted_sum.py	0.00% <0.00%> (ø)
articlequality/extractors/tests/test_ptwiki.py	100.00% <0.00%> (ø)
articlequality/extractors/ptwiki.py	100.00% <0.00%> (+20.00%)	⬆️

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